Found in the December 1974 issue of Radio Electronics, this circuit is similar to the previous one, only using another TTL counter. The circuit must be powered by 5 V.
Using the LM3914, this circuit is suitable for benchtop experiments. It was found in the March 1995...
This very sensitive circuit works almost like an electroscope. The FET can be the BF245 and it...
This 50's receiver includes an amplifier stage with a transistor complementary to the CK722, in...